Category: Exchange

and got an exception “The email message cannot be sent .make sure the email has a valid recipient“.

The reason is the ClientContext, you are passing to the function. Make sure the sharepoint site with which you created the Client Context has the Mail Recipient listed in the All People Group. To check that,

Ever tried to get tasks or emails from exchange using ews and faced this weird exception id is malformed. In my case, i had a http get to my ews method which accepted the id as a query string and id contains some special characters like +, / , = . and all the + characters were replaced by spaces during the http get call. a example id will look like this.